EP1189471A1 - Method for distributing encryption keys for an overlay data network - Google Patents

Method for distributing encryption keys for an overlay data network Download PDF

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Publication number
EP1189471A1
EP1189471A1 EP01302757A EP01302757A EP1189471A1 EP 1189471 A1 EP1189471 A1 EP 1189471A1 EP 01302757 A EP01302757 A EP 01302757A EP 01302757 A EP01302757 A EP 01302757A EP 1189471 A1 EP1189471 A1 EP 1189471A1
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EP
European Patent Office
Prior art keywords
network
key
user
communication
mobile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01302757A
Other languages
German (de)
French (fr)
Inventor
Douglas N. Knisely
Robert Jerrold Marks
Semyon B. Mizikovsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of EP1189471A1 publication Critical patent/EP1189471A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
    • H04L63/061—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key exchange, e.g. in peer-to-peer networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/043—Key management, e.g. using generic bootstrapping architecture [GBA] using a trusted network node as an anchor
    • H04W12/0431—Key distribution or pre-distribution; Key agreement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
    • H04L2463/062—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying encryption of the keys
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/18—Network architectures or network communication protocols for network security using different networks or channels, e.g. using out of band channels

Definitions

  • the present invention relates to communications; more specifically, the security of the authentication process used in communication systems.
  • FIG. 1 illustrates a base station 10, its associated cell 12 and mobile 14 within cell 12.
  • base station 10 authenticates or verifies the mobile's identity before allowing the mobile access to the communication network.
  • the authentication of mobile 14 involves communicating with authentication center 16.
  • Authentication center 16 then accesses a home location register 22 which is associated with mobile 14.
  • Home location register 22 may be associated with the terminal or mobile by an identifier such as the mobile's telephone number.
  • the information contained in the home location register is used to generate encryption keys and other information. This information is used to supply base station 10 with information that is transmitted to mobile 14 so that mobile 14 can respond and thereby be authenticated as a mobile that is entitled to receive communication services.
  • FIGS. 2a and 2b illustrate the authentication process used for an IS-41 compliant network.
  • IS-41 compliant networks are networks that use, for example, AMPS, TDMA or CDMA protocols.
  • both the mobile and home location register contain a secret value called AKEY.
  • AKEY a secret value stored in the home location register associated with the mobile is used to produce the keys.
  • the keys values calculated are the SSDA (Shared Secret Data A) and SSDB (Shared Secret Data B) values. These values are calculated by performing the CAVE algorithm or function using a random number R s as an input and the value AKEY as the key input.
  • the CAVE algorithm is well known in the art and is specified in the IS-41 standard.
  • the network then updates the key values SSDA and SSDB that will be used by the mobile by transmitting R s to the mobile.
  • the mobile then calculates SSDA and SSDB in the same fashion as calculated by the authentication center. Now that the mobile and home location register both contain the SSDA and SSDB values, the authentication process may take place.
  • FIG. 2b illustrates how a mobile is authenticated to a network after both the mobile and home location register have received the keys SSDA and SSDB.
  • the authentication center challenges the mobile by sending a random number R N to the mobile.
  • both the mobile and authentication center calculate the value AUTHR, where AUTHR is equal to the output of the CAVE algorithm using the random number R N as an input and the SSDA value as the key input.
  • the mobile then transmits the calculated value AUTHR to the authentication center.
  • the authentication center compares its calculated value of AUTHR and the value received from the mobile. If the values match, the mobile is authenticated and it is given access to the network.
  • both the mobile and the authentication center calculate the value of cipher key K c where the value K c is equal to the output of the CAVE algorithm using the value R N as an input and the value SSDB as the key input.
  • communications between the mobile and network are permitted and may be encrypted using a cryptographic function where the inputs are the message to be encrypted and the key value is K c .
  • the present invention uses a first communication network to securely communicate a key that is used for communications over a different network.
  • a CDMA network is used to securely communicate a key that is used for communications in a data network.
  • the key used in the data network may be used for authentication and/or enciphering or encryption.
  • FIG. 3 illustrates CDMA network 50 and HDR (Higher Data Rate) network 60.
  • CDMA network 50 is a network that provides secure communications and user authentication.
  • Network 50 may be a network other than a CDMA network such as a TDMA network, GSM network, AMPS network or another type of wireless voice network.
  • Mobile station 62 communicates with network 50 via base station 64. Initially, mobile station 62 is authenticated by network 50 as described earlier through communications between base station 64 and authentication center 66 which includes home location register 68. It is also possible for base station 64 to communicates with authentication center 66 via mobile switching center 70.
  • communication network 50 is not mobile station 62's home network
  • the authentication process is carried out through authentication center 72 and visiting location register 74 which communicate with authentication center 76 and home location register 78 in the mobile's home network.
  • mobile station 62 has been authenticated by network 50 communicates are carried out through base station 64 and mobile switching center 70 to either public switched telephone network 80 or short message service message center (SMS MC) 90.
  • SMS MC short message service message center
  • mobile station 62 may be in communication with or may include application terminal 100 when carrying out data communications.
  • application terminal 100 may be a portable computer in communication with mobile station 62, or it may be a communication application being run by mobile station 62.
  • Data communications are typically carried out by application terminal 100 through mobile station 62 via data network 60.
  • Data network 60 may be a data network such as an HDR radio access network (H -RAN).
  • Network 60 may include elements such as base station 110 and switching center 112.
  • Switching center 112 allows base station 110 to communicate with internet protocol (IP) network 114 and packet data service network (PDSN) 116.
  • IP internet protocol
  • PDSN packet data service network
  • application terminal 100 communicates with the destination application terminal or server 118 via mobile station 62, base station 110, switching center 112 and PSDN 116.
  • IP internet protocol
  • PDSN packet data service network
  • Network 50 performs an authentication of mobile station 62 and provides a ciphering key K c to mobile station 62. Once mobile station 62 and network 50 have agreed on a cipher key K c , secure communications may be carried out between network 50 and mobile station 62.
  • the session key that will be used for authentication, and/or enciphering or encryption of communications between application terminal 100 and network 60 is provided to application terminal 100 via a secure communication between network 50 and mobile station 62.
  • FIG. 4 illustrates the process by which the session key that will be used for communications between application terminal 100 and network 60 is communicated to application terminal 100 using network 50. Each step in this process is outlined below in reference to FIG. 4.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Computer And Data Communications (AREA)

Abstract

A first communication network is used to securely communicate a key that is used for communications over a different network. In one embodiment, a CDMA network is used to securely communicate a key that is used for communications in a data network. The key used in the data network may be used for authentication and/or enciphering or encryption.

Description

    Background of the Invention Field of the Invention
  • The present invention relates to communications; more specifically, the security of the authentication process used in communication systems.
    • Description of the Related Art
  • FIG. 1 illustrates a base station 10, its associated cell 12 and mobile 14 within cell 12. When mobile station 14 first registers or attempts communications with base station 10, base station 10 authenticates or verifies the mobile's identity before allowing the mobile access to the communication network. The authentication of mobile 14 involves communicating with authentication center 16. Authentication center 16 then accesses a home location register 22 which is associated with mobile 14. Home location register 22 may be associated with the terminal or mobile by an identifier such as the mobile's telephone number. The information contained in the home location register is used to generate encryption keys and other information. This information is used to supply base station 10 with information that is transmitted to mobile 14 so that mobile 14 can respond and thereby be authenticated as a mobile that is entitled to receive communication services.
  • FIGS. 2a and 2b illustrate the authentication process used for an IS-41 compliant network. IS-41 compliant networks are networks that use, for example, AMPS, TDMA or CDMA protocols. In this system, both the mobile and home location register contain a secret value called AKEY. Before the actual authentication process can start, a key update is performed by providing the mobile with keys that will be used with encryption functions for authentication and communication. The AKEY value stored in the home location register associated with the mobile is used to produce the keys. The keys values calculated are the SSDA (Shared Secret Data A) and SSDB (Shared Secret Data B) values. These values are calculated by performing the CAVE algorithm or function using a random number Rs as an input and the value AKEY as the key input. The CAVE algorithm is well known in the art and is specified in the IS-41 standard. The network then updates the key values SSDA and SSDB that will be used by the mobile by transmitting Rs to the mobile. The mobile then calculates SSDA and SSDB in the same fashion as calculated by the authentication center. Now that the mobile and home location register both contain the SSDA and SSDB values, the authentication process may take place.
  • FIG. 2b illustrates how a mobile is authenticated to a network after both the mobile and home location register have received the keys SSDA and SSDB. The authentication center challenges the mobile by sending a random number RN to the mobile. At this point both the mobile and authentication center calculate the value AUTHR, where AUTHR is equal to the output of the CAVE algorithm using the random number RN as an input and the SSDA value as the key input. The mobile then transmits the calculated value AUTHR to the authentication center. The authentication center compares its calculated value of AUTHR and the value received from the mobile. If the values match, the mobile is authenticated and it is given access to the network. In addition, both the mobile and the authentication center calculate the value of cipher key Kc where the value Kc is equal to the output of the CAVE algorithm using the value RN as an input and the value SSDB as the key input. At this point, communications between the mobile and network are permitted and may be encrypted using a cryptographic function where the inputs are the message to be encrypted and the key value is Kc.
  • As illustrated above, many of today's wireless voice networks such as CDMA, TDMA, GSM and AMPS networks provide for securely communicating encryption or cipher keys between a network and a mobile terminal. Unfortunately, this capability is not available in other networks.
    • Summary of the Invention
  • The present invention uses a first communication network to securely communicate a key that is used for communications over a different network. In one embodiment, a CDMA network is used to securely communicate a key that is used for communications in a data network. The key used in the data network may be used for authentication and/or enciphering or encryption.
    • Brief Description of the Drawings
  • FIG. 1 illustrates communications between a mobile and authentication center;
  • FIGS. 2a and 2b illustrate the key update and authentication process for an IS-41 compliant network;
  • FIG. 3 illustrates a first network that securely provides a key for use in a second or overlay network; and
  • FIG. 4 illustrates the process for providing a key for communications in an overlay network using secure communications over another network.
    • Detailed Description of the Invention
  • FIG. 3 illustrates CDMA network 50 and HDR (Higher Data Rate) network 60. CDMA network 50 is a network that provides secure communications and user authentication. Network 50 may be a network other than a CDMA network such as a TDMA network, GSM network, AMPS network or another type of wireless voice network. Mobile station 62 communicates with network 50 via base station 64. Initially, mobile station 62 is authenticated by network 50 as described earlier through communications between base station 64 and authentication center 66 which includes home location register 68. It is also possible for base station 64 to communicates with authentication center 66 via mobile switching center 70. If communication network 50 is not mobile station 62's home network, the authentication process is carried out through authentication center 72 and visiting location register 74 which communicate with authentication center 76 and home location register 78 in the mobile's home network. After mobile station 62 has been authenticated by network 50 communicates are carried out through base station 64 and mobile switching center 70 to either public switched telephone network 80 or short message service message center (SMS MC) 90.
  • In some instances, mobile station 62 may be in communication with or may include application terminal 100 when carrying out data communications. For example, application terminal 100 may be a portable computer in communication with mobile station 62, or it may be a communication application being run by mobile station 62. Data communications are typically carried out by application terminal 100 through mobile station 62 via data network 60. Data network 60 may be a data network such as an HDR radio access network (H -RAN). Network 60 may include elements such as base station 110 and switching center 112. Switching center 112 allows base station 110 to communicate with internet protocol (IP) network 114 and packet data service network (PDSN) 116. When involved in data communications, application terminal 100 communicates with the destination application terminal or server 118 via mobile station 62, base station 110, switching center 112 and PSDN 116.
  • Network 50 performs an authentication of mobile station 62 and provides a ciphering key Kc to mobile station 62. Once mobile station 62 and network 50 have agreed on a cipher key Kc, secure communications may be carried out between network 50 and mobile station 62. The session key that will be used for authentication, and/or enciphering or encryption of communications between application terminal 100 and network 60 is provided to application terminal 100 via a secure communication between network 50 and mobile station 62.
  • FIG. 4 illustrates the process by which the session key that will be used for communications between application terminal 100 and network 60 is communicated to application terminal 100 using network 50. Each step in this process is outlined below in reference to FIG. 4.
  • a) Application terminal (AT) requests the PPP (Point to Point Protocol) connection sending the PPPREQ (PPP Request) message to the Mobile Station (MS).
  • b) The MS is the combination IS-2000 & HDR terminal. The MS sends the IS-2000 registration to the IS-2000 RAN (Radio Access Network) (MSC/BSC/VLR).
  • c) The VLR conducts registration and authentication procedure with the HLR.
  • d) The registration and authentication procedure is complete. The session Ciphering Key (Kc) is available at the VLR/MSC/BSC.
  • e) The registration session is completed and the Kc is available at the MS.
  • f) The MS sends the PPPREQ to the HDR RAN. The message is identified by the MS IMSI (A mobile station or user identifier).
  • g) The HDR RAN selects the random HDR Session Key, HDR-SSD.
  • h) The HDR RAN generates the IS-41 SMS Delivery Point-to-Point (SMDPP) message addressed to the MS. The message is identified as the HDR_Teleservice_Message. The message contains the HDRSSDUPD (HDR SSD Update Request) and a parameter set to the value of HDR_SSD. The message is sent to the IS-41 SMS MC with instruction for secure delivery. The IS-41 SMS MC forwards the SMS message to the IS-41 VLR/MSC/BSC.
  • i) The IS-41 VLR/MSC/BSC encrypts the message using the Kc and sends it to the MS over the IS-2000 air interface as encrypted SMS message.
  • j) The MS decrypts received SMS message and forwards the contents - the HDRSSDUPD Request with the HDR-SSD parameter - to the AT with the MS IMSI included.
  • k) The AT calculates the digital signature (MAC) of the IMSI using the HDR_SSD as the key, and sends the signature to the MS as the response.
  • l) The MS assembles the response SMS message for the HDR RAN and sends it to the IS-41 MC. The message contains the Digital Signature of the MS IMSI calculated in step (k).
  • m) The IS-41 MC sends the smdpp response to the HDR RAN containing the Digital Signature of IMSI.
  • n) The HDR RAN validates the Digital Signature of IMSI.
  • o) The HDR RAN sends the PPPREQ (PPP Request) to the PDSN for specific IMSI. Optionally, it may include the HDR_SSD to be used for the session encryption at the PPP level.
  • p) The PDSN established the PPP and responds to the HDR RAN.
  • q) The HDR RAN responds to the MS with the pppreq response.
  • r) The MS forwards the pppreq response to the AT.
  • s) The PPP session is established between the AT and PDSN and may be encrypted using the HDR_SSD.

Claims (15)

  1. A method of providing a communication key to a user, characterized by the step of:
       using a first network to securely provide a communication key to a user for use in communications over a second network.
  2. The method of claim 1, characterized in that the first network is a CDMA network.
  3. The method of claim 1, characterized in that the first network is a TDMA network.
  4. The method of claim 1, characterized in that the first network is a GSM network.
  5. The method of claim 1, characterized in that the first network is an AMPS network.
  6. The method of claim 1, characterized in that the second network is a data communications network.
  7. The method of claim 1, characterized in that the second network is a voice communications network.
  8. A method of providing a communication key to a user, characterized by the step of:
       using a first network to securely provide a communication key to a user for use in communications over a second network, where the first network securely transmits the key using a ciphering key.
  9. A method of providing a communication key to a user, characterized by the step of:
       using a CDMA network to securely provide a communication key to a user for use in communications over a second network, where the first network securely transmits the key using a ciphering key and where the second network is a data network.
  10. A method of providing a communication key to a user, characterized by the steps of:
    receiving a communications key from a first communication network; and
    providing the communiction key to a user using a second communication network, where the communication key is used for communications over the first network.
  11. The method of claim 10, characterized in that the step of providing comprises securely providing the communication key to the user.
  12. A method of providing a communication key to a user, characterized by the steps of:
    providing a communication key to a first communication network for delivery to a user; and
    using the communication key for communications with the user over a second communications network.
  13. The method of claim 12, characterized in that the step of providing comprises providing the communication key for secure delivery to the user.
  14. The method of claim 1,8,9,10 or 12, characterized in that the key is an encryption key.
  15. The method of claim 1,8,9,10,12 or 14, characterized in that the key is an authentication key.
EP01302757A 2000-09-15 2001-03-26 Method for distributing encryption keys for an overlay data network Withdrawn EP1189471A1 (en)

Applications Claiming Priority (2)

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US662580 2000-09-15
US09/662,580 US7200750B1 (en) 2000-09-15 2000-09-15 Method for distributing encryption keys for an overlay data network

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CN100562167C (en) * 2006-04-24 2009-11-18 中兴通讯股份有限公司 A Method for Authenticating CDMA Users Roaming to GSM Networks
CN1553610B (en) * 2003-05-30 2010-04-28 华为技术有限公司 Authentication method for code division multiple access system user roaming to global system for mobile communication

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US7181196B2 (en) * 2003-05-15 2007-02-20 Lucent Technologies Inc. Performing authentication in a communications system
US7593717B2 (en) 2003-09-12 2009-09-22 Alcatel-Lucent Usa Inc. Authenticating access to a wireless local area network based on security value(s) associated with a cellular system
CN1601958B (en) * 2003-09-26 2010-05-12 北京三星通信技术研究有限公司 HRPD Network Access Authentication Method Based on CAVE Algorithm
WO2006099296A2 (en) * 2005-03-10 2006-09-21 Nexthop Technologies, Inc. Flexible, scalable, wireless data forwarding and mobility for secure wireless networks
US9258696B2 (en) * 2009-02-11 2016-02-09 Alcatel-Lucent Method for secure network based route optimization in mobile networks
BR102012003114B1 (en) * 2012-02-10 2021-06-22 Mls Wirelles S/A. method to enable user and method to authenticate user on a 3g traffic bypass wifi network

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JP2002152190A (en) 2002-05-24
US7200750B1 (en) 2007-04-03

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